Boiler plant



June 18, l935 N. BRUNZEL BOILER PLANT Filed sept. 17, 1952.

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atentedl June i @QUERER l? I Norbert 1B Wiltlrovilce-Zeleaarny,

@cechoelovahila Appiilcation September 17, 11.932, Seriali No. ttil lin Germ September lt, lliDSll 4l @Balma As a result of water and impurities from the boilers finding their way into the superheaters and to the points where the steam is consumed, dimculties occur in boiler plants from the forma- 5 tion of deposits in the superheaters, piping and fittings, and above all in the steam engines. The troubles become manifest, especially in turbines, by fouling, corrosion and erosion of the blading through the action of the salts and impurities contained in the steam. It has also been ascer-I tained that water carried over in the steam can pass through the superheater without becoming evaporated.

According to the invention these dimculties are removed, particularly in plants equipped with Lmer boilers, by employing rotary pumps for feeding the saturated steam through the superheater and maintaining the circulation of the steam, the centrifugal action of said pumps being utilized for removing suspended water and impurities from the saturated steam.

Figs. 1 and 2 of the accompanying drawing i1- lustrate, in cross-section and longitudinal section respectively, a typical embodiment of a ro-l tary, steam-circulation pump for the removal of water and impurities in accordance with the invention; and

Fig. 3 s'hows a Lffler boiler plant equipped with such a pump.

lli'he steam-circulation pump consists of a casing l having an intake branch 2, a delivery branch it, and an annular delivery chamber t in which the flow proceeds in the direction of the arrow and which may be circular in cross section. A rotor b is mounted on a shaft lli, which extends to the outside of the 'casing l through a stuffing box l and is journalled in a bearing t. Water (and any impurity) centrifuged from the saturated steam, during its passage, by the rotor 5 collects in a preferably continuous channel t located in the inner Wall of the delivery chamber t facing the rotor t, for example directly opposite the perimeter of the rotor. The separated water is Aremoved from this channel t through openings or pockets lil and pipes Ill connected thereto. The discharge openings l@ are screened od from the flow in the steam delivery chamber ill by inserted blades it. The steam delivery branch t leads out of the delivery chamber l at a point oset in relation to the collecting channel 9, the steam being diverted, by suitable inset members, so as to encounter as little resistance as possible, and enable the ow to proceed in a manner analogous to that in a spiral casing. Spiral casings can also be designed in a correspondin t 1 er,

(Cl. MMM) In the arrangement of the LiilerA boiler represented in Fig. 3 everything that is unessential for the present invention has been omitted. The saturated steam from the boiler drum K, in which the water is evaporated b'y superheated steam blast, is drawn by the steam-circulation pump P, through the pipe s, and is positively fed through the superheater U. Part of the superheated steam is forced in circulation, as heat carrier, through the pipes d and d', into the water space of the boiler drum K, and part is passed to the points of consumption by way of the pipe o. Water separated from the saturated steam in the pump P, by utilizing the centrifugal action, is removed from the pump 'casing through the pipes l l and is returned direct to the boiler drum K through a control valve i3, a steam trap or the like.

The described method of removing water from saturated steam can also be applied, with the same advantage, to modifications of the Lffler boiler. Moreover, a similar advantage can be obtained in the case, for example, of steam generators in which the resulting saturated steam is forced into the superheater by means of a pump.

I claimzl. The process of removing water and impurities from steam in a boiler plant including a boiler and superheater in series and connections for returning steam from the superheater to the boiler, comprising raising the pressure of the steam by a centrifugal action prior to its passage into the superheater, and utilizing said centrifugal action for separating water and impurities from said steam.

2. The process of removing Water and impurities from steam in a boiler plant including a boiler and superheater in series and connections for returning steam from the superheater to the boiler, comprising raising the pressure of the steam by a centrifugal action prior to its passage into the superheater, utilizing said centrifugal action -for separating water and impurities from said steam and returning the water so separated directly to the boiler.

3. In a high pressure steam generating system comprising a boiler, a steam superheater, and a conduit for delivering superheated steam from said superheater to said boiler, whereby high pressure steam may be generated in the latter, a rotary pump interposed between said boiler and said superheater, said pump .comprising means for simultaneously eiecting circulation of the steam and separation of -water and impurities from the circulating steam.

4. In a high pressure steam generating system comprising a. boiler, a steam superheater, and a conduit for delivering superheated steam from said superheater to said boiler, whereby high 5 pressure steam may be generated in the lattena rotary pump interposed between said boiler and said superheater, said pump comprising means for simultaneously circulating the steam and separating Water and impurities from the circulating steam, and means for returning the separated water directly from the pump to the boiler.

' NORBERT BRUNZEL. 

